Paediatric Strabismus and Amblyopia Management
A 5-year-old girl is brought by her mother for a routine eye examination. The mother reports that the child sometimes tilts her head to the left and squints her right eye when watching television. Visual acuity with a picture chart is 20/100 in the right eye and 20/40 in the left eye. Cover test reveals a right esotropia of 20 prism diopters at distance and near. Cycloplegic retinoscopy (cyclopentolate 1%) shows +2.00 DS in both eyes. Fundus examination is normal. The child has no known systemic conditions. The mother is concerned about the cost of treatment and whether glasses are necessary.
1. What is the diagnosis and what is the first-line treatment?
Read the worked answer
The diagnosis is accommodative esotropia with amblyopia of the right eye. The child is hyperopic (+2.00 DS) and has an esotropia of 20 PD. The amblyopia is likely due to the strabismus. First-line treatment is full cycloplegic correction with spectacles: +2.00 DS both eyes. This should be worn full-time. The glasses will reduce accommodative demand and may fully or partially correct the esotropia. The amblyopia should be treated with patching of the left eye (the better eye) for 2-4 hours per day, depending on compliance. The family should be educated about the importance of wearing glasses and patching. The cost of glasses can be mitigated by choosing affordable frames and lenses; the child's vision is at stake. The mother should be reassured that early treatment is effective. Follow-up in 6-8 weeks to assess alignment and vision. If the esotropia persists after glasses, surgery may be considered, but first optimize refractive correction and amblyopia therapy.
2. How would you monitor and adjust the treatment plan over the next year?
Read the worked answer
At each visit (every 2-3 months initially), assess visual acuity in both eyes, perform cover test with and without glasses, and check compliance. If the esotropia is fully corrected with glasses and vision improves, continue patching until vision is equal or within one line. If amblyopia persists, consider increasing patching time or using atropine penalization if patching is difficult. If the esotropia remains despite glasses, consider bifocal lenses to relax accommodation further, or surgical referral. Monitor for changes in refraction; hyperopia may decrease with age, so repeat cycloplegic refraction annually. Also monitor for patching complications (e.g., occlusion amblyopia in the good eye). The mother should be involved in the plan and given clear instructions. If the child is non-compliant with glasses, discuss strategies. The goal is to prevent permanent vision loss and maintain binocular vision.